CN-120724016-B - Power distribution network line parameter identification and calibration method and device and electronic equipment

CN120724016BCN 120724016 BCN120724016 BCN 120724016BCN-120724016-B

Abstract

The invention provides an identification and calibration method, device and electronic equipment for line parameters of a power distribution network, wherein the identification and calibration method for the line parameters of the power distribution network comprises the steps of obtaining and analyzing CIM files of a target power grid, constructing a simplified topological structure of electrical equipment in the CIM files, constructing a node power flow equation based on node parameters of each node in the simplified topological structure, respectively constructing a first correction equation and a second correction equation based on the node power flow equation and a quasi-Newton-Lafson method, outputting corresponding target power grid parameters when the first correction equation and the second correction equation meet iteration conditions respectively, constructing a power grid topological structure of the target power grid according to the target power grid parameters and the simplified topological structure, obtaining high-precision line parameters, and calibrating the CIM files of the target power grid. The method and the device solve the problem of poor accuracy of identifying the power distribution network line parameters in the prior related technology.

Inventors

LIN YIYU
LIU CHENGXI
TANG PENGFEI

Assignees

武汉大学

Dates

Publication Date: 20260505
Application Date: 20250609

Claims (8)

1. The identification and calibration method for the power distribution network line parameters is characterized by comprising the following steps of: acquiring and analyzing a CIM file of a target power grid, and constructing a simplified topological structure of electrical equipment in the CIM file; Constructing a node tide equation based on node parameters of each node in the simplified topological structure; Based on the node power flow equation and the quasi-Newton-Laporton method, respectively constructing a first correction equation and a second correction equation, and outputting corresponding target power grid parameters when the first correction equation and the second correction equation respectively meet iteration conditions; Constructing a power grid topological structure of the target power grid according to the target power grid parameters and the simplified topological structure to obtain high-precision line parameters, and calibrating CIM files of the target power grid; based on the node power flow equation and the quasi-Newton-Laporton method, respectively constructing a first correction equation and a second correction equation, including: taking a transformer tap ratio, a voltage phase angle and a voltage amplitude as solving variables, and constructing a first correction equation and a first jacobian matrix through the node power flow equation and a quasi-Newton-Laporton method; Taking the conductance, susceptance, voltage phase angle and voltage amplitude as solving variables, and constructing the second correction equation and a second jacobian matrix through the node power flow equation and the quasi-Newton-Laporton method; when the first correction equation and the second correction equation respectively meet the iteration conditions, outputting corresponding target grid parameters, including: When the deviation value of the transformer tap ratio, the deviation value of the voltage amplitude and the deviation value of the voltage phase angle in the iteration process are smaller than a first preset iteration threshold, taking a value in a preset value range where the current transformer tap ratio is located, and outputting a target transformer tap; and when the conductance deviation value, the susceptance deviation value, the voltage amplitude deviation value and the voltage phase angle deviation value in the iteration process are smaller than a second preset iteration threshold value, taking the current conductance and the current susceptance as target conductance and target susceptance output.
2. The method for identifying and calibrating line parameters of a power distribution network according to claim 1, wherein obtaining and analyzing a CIM file of a target power grid, and constructing a simplified topological structure of electrical equipment in the CIM file comprises: extracting equipment initial parameters and topological connection relations of all electrical equipment in the CIM file; and generating the simplified topological structure according to the equipment initial parameters of the electrical equipment and the topological connection relation.
3. The method for identifying and calibrating line parameters of a power distribution network according to claim 2, wherein generating the simplified topology according to the device initial parameters of the electrical device and the topology connection relationship comprises: Extracting an electric model and a connecting end in the CIM file, wherein the electric model comprises a transmission line, a switch, a bus, a transformer winding and a transformer; Traversing all the connecting ends in the CIM file, and connecting the electrical models with the same connecting points to form an initial topological structure; Simplifying the initial topological structure based on the type of the electrical model and the connection relation of the nodes in the initial topological structure to obtain the simplified topological structure.
4. A method of identifying and calibrating line parameters of a power distribution network according to claim 3, wherein simplifying the initial topology based on the type of the electrical model and the connection relation of nodes in the initial topology to obtain the simplified topology comprises: deleting all switches in the initial topological structure, and merging nodes corresponding to the switches; Deleting a first node in the initial topological structure, wherein the first node is a node which is not accessed with a load and is connected with only one line; Deleting a second node in the initial topological structure, and combining two end circuits corresponding to the second node, wherein the second node is a node which is connected with only two circuits and is not connected with a transformer.
5. The method of claim 2, wherein when the current conductance and the current susceptance are taken as the target conductance and the target susceptance, the target conductance and the target susceptance are limited to the initial value range of the conductance and the susceptance in the initial parameters of the electrical equipment.
6. The identification and calibration method for the line parameters of the power distribution network according to claim 2, wherein the underdetermined equation in the node power flow equations is an node power flow equation when the number of lines of the jacobian matrix is larger than the number of columns, and is iteratively solved through a minimum norm and a singular value decomposition method; and carrying out iterative solution on an overdetermined equation in the node load flow equation by a least square method and a singular value decomposition method, wherein the overdetermined equation is the node load flow equation when the number of rows of the jacobian matrix is smaller than the number of columns.
7. An identification and calibration device for power distribution network line parameters, comprising: The construction module is used for acquiring and analyzing a CIM file of the target power grid and constructing a simplified topological structure of the electrical equipment in the CIM file; The processing module is used for constructing a node tide equation based on node parameters of each node in the simplified topological structure; the operation module is used for respectively constructing a first correction equation and a second correction equation based on the node power flow equation and the quasi-Newton-Laporton method, and outputting corresponding target power grid parameters when the first correction equation and the second correction equation respectively meet iteration conditions; the calibration module is used for constructing a power grid topological structure of the target power grid according to the target power grid parameters and the simplified topological structure, obtaining high-precision line parameters and calibrating CIM files of the target power grid; based on the node power flow equation and the quasi-Newton-Laporton method, respectively constructing a first correction equation and a second correction equation, including: taking a transformer tap ratio, a voltage phase angle and a voltage amplitude as solving variables, and constructing a first correction equation and a first jacobian matrix through the node power flow equation and a quasi-Newton-Laporton method; Taking the conductance, susceptance, voltage phase angle and voltage amplitude as solving variables, and constructing the second correction equation and a second jacobian matrix through the node power flow equation and the quasi-Newton-Laporton method; when the first correction equation and the second correction equation respectively meet the iteration conditions, outputting corresponding target grid parameters, including: When the deviation value of the transformer tap ratio, the deviation value of the voltage amplitude and the deviation value of the voltage phase angle in the iteration process are smaller than a first preset iteration threshold, taking a value in a preset value range where the current transformer tap ratio is located, and outputting a target transformer tap; and when the conductance deviation value, the susceptance deviation value, the voltage amplitude deviation value and the voltage phase angle deviation value in the iteration process are smaller than a second preset iteration threshold value, taking the current conductance and the current susceptance as target conductance and target susceptance output.
8. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method for identifying and calibrating line parameters of a power distribution network according to any of claims 1 to 6 when the program is executed by the processor.

Description

Power distribution network line parameter identification and calibration method and device and electronic equipment Technical Field The present invention relates to the field of power distribution network technologies, and in particular, to a method and an apparatus for identifying and calibrating line parameters of a power distribution network, and an electronic device. Background With the wide access of distributed energy sources in a power distribution network and the dynamic evolution of complex load characteristics, the traditional power grid modeling method based on fixed parameters faces serious challenges. Inaccuracy of the line parameters can negatively impact multiple key system analysis links of the power distribution network. In trend calculation, parameter deviation can cause larger deviation between a calculation result and actual power distribution and voltage conditions, thereby affecting the accurate control of a dispatcher on the running state of a power grid and the reasonable arrangement of the running mode, inaccurate parameters can interfere the accurate judgment of the fault position during fault positioning, the fault checking and repairing time is prolonged, the power supply reliability is reduced, and the actual running state of the power grid is difficult to truly reflect due to parameter errors in a state estimation link. The Chinese patent with the publication number of CN117787543A discloses a power distribution network line parameter calculation method and system based on low-voltage measurement, wherein the method comprises the steps of obtaining distribution transformer low-voltage measurement data and carrying out corresponding pretreatment, wherein the corresponding pretreatment comprises the steps of carrying out filtering treatment on the measurement data based on self-adaptive Kalman filtering and sliding average filtering, carrying out missing value treatment on the filtered data, constructing a power distribution network topological structure based on the pretreated measurement data and simplifying the power distribution network topological structure to obtain a line-point connection model of only a reserved line, a distribution transformer and a user, constructing an objective function for parameter solving by combining power distribution network line parameter power based on the line-point connection model, and obtaining the power distribution network line parameter by solving the objective function. However, the scheme only depends on Kalman and moving average filtering, has poor noise immunity on phase angle deletion and noise, and the objective function is only based on power conservation, so that a pathological or singular matrix is easy to appear, and the accuracy and reliability are insufficient, and the answer accuracy is insufficient. For the problem of poor accuracy of power distribution network line parameter identification in the prior related art, no effective solution is proposed at present. Disclosure of Invention The invention provides a method and a device for identifying and calibrating power distribution network line parameters and electronic equipment, which are used for solving the defect of poor accuracy of power distribution network line parameter identification in the prior related technology. In a first aspect, the present invention provides a method for identifying and calibrating line parameters of a power distribution network, including: acquiring and analyzing a CIM file of a target power grid, and constructing a simplified topological structure of electrical equipment in the CIM file; Constructing a node tide equation based on node parameters of each node in the simplified topological structure; Based on the node power flow equation and the quasi-Newton-Laporton method, respectively constructing a first correction equation and a second correction equation, and outputting corresponding target power grid parameters when the first correction equation and the second correction equation respectively meet iteration conditions; And constructing a power grid topological structure of the target power grid according to the target power grid parameters and the simplified topological structure, obtaining high-precision line parameters, and calibrating CIM files of the target power grid. According to the identification and calibration method for the power distribution network line parameters, provided by the invention, the CIM file of the target power grid is obtained and analyzed, and the simplified topological structure of the electrical equipment in the CIM file is constructed, and the method comprises the following steps: extracting equipment initial parameters and topological connection relations of all electrical equipment in the CIM file; and generating the simplified topological structure according to the equipment initial parameters of the electrical equipment and the topological connection relation. According to the identification and calib